tomorrow, secretary of state john kerry flies to ukraine. he will meet with the new ukrainian government leaders about the russian takeover of the crimean peninsula. thousands of russian troops have surrounded military bases. they are demanding that ukrainian soldiers give up their weapons. in response to russia's actions, the u.s. and six other nations are canceling plans to go to the g-8 summit in russia in june. in a joint statement, the countries say russia's advances in ukraine violate the principles and values on which the g-8 operates. >>> oil refineries could feel the impact of the growing tension between russia and ukraine. the price of crude oil is already up a dollar a barrel. oil analysts are worried and economic embargo could be placed against russia. that would cut the supply and the impact would be felt around the world. russia is the second largest producer of energy. >>> around the country, including in san francisco, ukrainian americans have taken to the streets to protest russia's actions. >>> ukrainians and supporters sta